Ostmark

Ostmark was a province of Nazi Germany formed in 1938 after Austria agreed to the Anschluss with Germany. The province retained Austria's capital of Vienna, but the former Federal State of Austria became a Reichsgau of Germany, ruled by a Nazi Party gauleiter. The region was liberated from the Nazi forces in April-May 1945 when the US Army and the Soviet Red Army invaded the Reich, and Ostmark was dismantled after the war's end on 8 May 1945, becoming an Austrian republic once more.